Emacs has a number of "registers", which you can treat as directly-addressable clipboards.Copy into register 1:
- select range
- M-x copy-to-register
- 1
Paste from register 1:
- M-x insert-register
- 1
View the contents of a register
- M-x view-register
- 1
Register names can be single letters, numbers, characters. Upper and lower case are distinct.